He died for our sins, 1 Cor. 15:3, so for the sins of those in the world who would

ever become saved. So not for the sins of those destined for the lake of fire.
For example 1 John 3:16 says: "The way he came to know love was that he laid down his life for us...". So he died for us saints. Had he died for the sins of those destined for the lake of fire, then their sins would be paid for too, they would get eternal life. Similarly Acts 20:28 says "... the church of God that he acquired with the blood of his own". So God acquired only the church with the blood of his own Son, who then paid for the sins of only the church, with his blood. Eph. 5:25 says "Husbands, love your wives, just as Christ loved the church and handed himself over for her". So he died for the sins of the church. Not for everybody in the world, or else they would all be saved.